/*
** $Id: ltable.h,v 2.23.1.2 2018/05/24 19:39:05 roberto Exp $
** Lua tables (hash)
** See Copyright Notice in lua.h
*/

#ifndef ltable_h
#define ltable_h

#include "lobject.h"


#define gnode(t, i)  (&(t)->node[i])
#define gval(n)    (&(n)->i_val)
#define gnext(n)  ((n)->i_key.nk.next)


/* 'const' to avoid wrong writings that can mess up field 'next' */
#define gkey(n)    cast(const TValue*, (&(n)->i_key.tvk))

/*
** writable version of 'gkey'; allows updates to individual fields,
** but not to the whole (which has incompatible type)
*/
#define wgkey(n)    (&(n)->i_key.nk)

#define invalidateTMcache(t)  ((t)->flags = 0)


/* true when 't' is using 'dummynode' as its hash part */
#define isdummy(t)    ((t)->lastfree == NULL)


/* allocated size for hash nodes */
#define allocsizenode(t)  (isdummy(t) ? 0 : sizenode(t))


/* returns the key, given the value of a table entry */
#define keyfromval(v) \
  (gkey(cast(Node *, cast(char *, (v)) - offsetof(Node, i_val))))


LUAI_FUNC const TValue *luaH_getint(Table *t, lua_Integer key);

LUAI_FUNC void luaH_setint(lua_State *L, Table *t, lua_Integer key,
                           TValue *value);

LUAI_FUNC const TValue *luaH_getshortstr(Table *t, TString *key);

LUAI_FUNC const TValue *luaH_getstr(Table *t, TString *key);

LUAI_FUNC const TValue *luaH_get(Table *t, const TValue *key);

LUAI_FUNC TValue *luaH_newkey(lua_State *L, Table *t, const TValue *key);

LUAI_FUNC TValue *luaH_set(lua_State *L, Table *t, const TValue *key);

LUAI_FUNC Table *luaH_new(lua_State *L);

LUAI_FUNC void luaH_resize(lua_State *L, Table *t, unsigned int nasize,
                           unsigned int nhsize);

LUAI_FUNC void luaH_resizearray(lua_State *L, Table *t, unsigned int nasize);

LUAI_FUNC void luaH_free(lua_State *L, Table *t);

LUAI_FUNC int luaH_next(lua_State *L, Table *t, StkId key);

LUAI_FUNC lua_Unsigned luaH_getn(Table *t);


#if defined(LUA_DEBUG)
LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key);
LUAI_FUNC int luaH_isdummy (const Table *t);
#endif


#endif
